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ZIF-8 film-coated Pd/ZnO core-shell catalyst and preparation method thereof

A ZIF-8, core-shell catalyst technology, applied in physical/chemical process catalysts, catalyst protection, organic compound/hydride/coordination complex catalysts, etc., to solve the problem of easy loss and wide application prospects

Active Publication Date: 2014-10-08
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to propose a metal-organic framework ZIF-8 film-coated supported noble metal core-shell catalyst and its preparation method in view of the disadvantages of the current preparation of heterogeneous catalysts

Method used

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  • ZIF-8 film-coated Pd/ZnO core-shell catalyst and preparation method thereof
  • ZIF-8 film-coated Pd/ZnO core-shell catalyst and preparation method thereof
  • ZIF-8 film-coated Pd/ZnO core-shell catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Preparation of PVP-stabilized Pd nanoparticles

[0024] Prepare 2mM H 2 PdCl 4 Aqueous solution 15ml, with 0.0667g PVP, 21ml H 2 O mixed, adding 1M HCl aqueous solution to adjust the mixture pH = 9, heated to boiling, immediately added 14ml of ethanol, refluxed for 3h, to obtain Pd nanoparticles stabilized by PVP;

[0025] (2) Preparation of ZnO carrier

[0026] Mix 1.098g of zinc acetate dihydrate with 50ml of diethylene glycol (DEG), and reflux at 160°C for 2 hours to obtain a spherical ZnO carrier with a particle size of 300-500nm;

[0027] (3) The PVP stabilized Pd nanoparticles obtained in step (1) are mixed with the spherical ZnO carrier obtained in step (2) at room temperature for 15h to obtain the ethanol solution of the Pd / ZnO catalyst;

[0028] (4) The ethanol solution of the Pd / ZnO catalyst obtained in step (3) is mixed with the 2-methylimidazole solution, wherein the concentration of 2-methylimidazole is 0.5M, and the molar amount of 2-methylimidazol...

Embodiment 2

[0031] (1) Preparation of PVP-stabilized Pd nanoparticles

[0032] Prepare 2mM H 2 PdCl 4 Aqueous solution 15ml, with 0.0667g PVP, 21ml H 2 O mixed, adding 1M HCl aqueous solution to adjust the mixture pH = 9, heated to boiling, immediately added 14ml of ethanol, refluxed for 3h, to obtain Pd nanoparticles stabilized by PVP;

[0033] (2) Preparation of ZnO carrier

[0034] Mix 1.098g of zinc acetate dihydrate with 50ml of diethylene glycol (DEG), and reflux at 160°C for 2 hours to obtain a spherical ZnO carrier with a particle size of 300-500nm;

[0035] (3) The PVP stabilized Pd nanoparticles obtained in step (1) are mixed with the spherical ZnO carrier obtained in step (2) at room temperature for 15h to obtain the ethanol solution of the Pd / ZnO catalyst;

[0036] (4) The ethanol solution of the Pd / ZnO catalyst obtained in step (3) was vacuum-dried overnight at 80° C., and placed in a desiccator for testing.

Embodiment 3

[0038] Take 0.1g of catalyst and put it in the reaction device, then add 15ml of ethyl acetate and 0.3ml of n-hexene, use hydrogen to purge the reaction device for 3 times, and react at 35°C for 24h. After the reaction, the catalyst and feed liquid were centrifuged, and the results were detected by gas chromatography (chromatographic column: HP-5; FID).

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Abstract

The invention discloses a ZIF-8 film-coated Pd / ZnO core-shell catalyst, belonging to the field of novel materials. A Pd / ZnO core uses spherical ZnO as a supporter; the particle size of the spherical ZnO supporter is 300nm-500nm; the spherical ZnO supporter is formed by accumulation of ZnO nanoparticles with the particle size of 20nm-40nm. A stable Pd nanoparticle of PVP (Polyvinyl Pyrrolidone) is taken as an active center, and the thickness of a ZIF-8 film coating the Pd / ZnO core is 100nm-150nm. The spherical ZnO supporter and the stable Pd nanoparticle of PVP are mixed and a 2-methylimidazole solution is added to act with ZnO so as to obtain the ZIF-8 film layer on the outer surface of Pd / ZnO. According to the ZIF-8 film-coated Pd / ZnO core-shell catalyst, the ZIF-8 film with a molecular screening function endows the supported noble metal catalyst with high selectivity to reactants and products; meanwhile, the problem of activity reduction caused by the fact that the active ingredients of heterogeneous catalysts are likely to run away and be poisoned in reaction are solved.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a ZIF-8 film-coated Pd / ZnO core-shell catalyst and a preparation method thereof. Background technique [0002] Metal organic frameworks (MOFs) are porous crystalline materials that are self-assembled by metal ions or metal clusters and organic ligands through covalent or ion-covalent interactions. It has outstanding advantages such as high specific surface area, porosity, and adjustable skeleton structure, and has great application potential in gas storage and separation, heterogeneous catalysis, molecular recognition, and sensing. Coating functional nanoparticles with MOFs film can effectively solve the problems of particle agglomeration, loss, poisoning, etc., and at the same time combine the functions of nanoparticles themselves with the characteristics of MOFs to obtain a new type of multifunctional core-shell material. . [0003] Zeolitic imidazolate frameworks (ZI...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/26B01J33/00B01J35/02C07C5/03C07C9/15C07C13/18B01J35/00
Inventor 张雄福林露张通刘海鸥邱介山
Owner DALIAN UNIV OF TECH
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